Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
mang va » mang vua, hang va, bang va
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((((hieu nganh) OR (hieu manh))) or (hieu lang)) - hanh mang va dung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((((hieu nganh) OR (hieu manh))) OR (hieu lang)) - hanh mang va dung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((((hieu nganh) OR (hieu manh))) or (hieu lang)) - hanh mang va dung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((((hieu nganh) OR (hieu manh))) or (hieu lang)) - hanh mang va dung cong tan toan cau*.